Interface to CORE:J9 (if buttons are used) and CORE:J6 (if encoders are used, MIDIbox16E only). DINX4:J1 provides two power pins for 5V/0V, the serial clock, the latch enable and the serial output of the register chain.
This port can also be connected with J2 of another DINX module.

J2

Interface to another DINX4 module. DINX4:J2 provides nearly the same pins like J1, just only the serial output of the first IC is replaced by the serial input of the last IC.
This port can be connected with J1 of another DINX module.